General description This BOSB18C battery adapter converts conventional B type square lithium batteries to arc C type batteries for power tools. With the BOSB18C, you can use the 18V professional Li-ion battery BAT618 on all 18V lithium power tools. Technical specifications Colour: Black Material: Plastic Size: 10 x 7 x 3.8 cm Package Contents: 1 x BOSB18C Measurement allowed error: +/- 1-3 cm